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REM sleep typically occupies 20â25% of total sleep in adult humans: about 90â120 minutes of a night's sleep. The first REM episode occurs about 70 minutes after falling asleep. Cycles of about 90 minutes each follow, with each cycle including a larger proportion of REM sleep.
Because of this loss of muscle tone, REM sleep in horses only occurs during lateral recumbency, or when a horse can lie in sternal and lean heavily against something. Horses spend only about a total of an hour in REM sleep over a 24 hour period. Horses that donât lie down and arenât experiencing deep sleep might exhibit signs of sleep deprivation. A sleep deprived horse could repeatedly get very drowsy then collapse to his knees and suddenly wake back up (Dr.